How many rivets are there in the Eiffel Tower? How many hours did Thomas Edison's first lightbulb last? How many miles long is the River Nile? How many hours per day does the average cat sleep? Make your best guess in this wonderful game of estimating far-out facts. Draw a card and ask others for their best estimate to one of the 600 questions. Then decide whether their answer is either OVER or UNDER the correct amount. Get the most right and you win!